Improvement in chucks for holding metal drills



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vW. Fnosrf cHUcK's Fon HQLDING METAL-MILLS. N..'1'7`6. 854.v

Patented May 2. 1876.

A' UNITED STATES PATENT CEEIOE;

wILLIAM FROST, OI NEw EEDEOED, MASSACHUSETTS.

||v|PR`ovEMENT|N cHucKs FOR HOLDING METAL DRlLLs.

i Speciiication forming part of Letters Patent No. l 76,854, 'dated May2, 1876; application iled March 25, 1876.

To all Iwhom it may concern:

Be it known that I, WILLIAM FROST, of New Bedford, inthe county ofBristol and State of Massachusetts,- have invented a new and ImprovedDrill-Chuck, ot' which the following is a speciiication:

My invention consists of a sliding jaw havin g a triangular notch and acouple of toothed jaws fined to slide at right anglesto the movement ofthe other, and arranged in its notch,

and being notched or toothed, so that one meshes in the other, andhaving a spring between them, for opening them, all being arranged in astock which attaches to the mandrel, and being so contrived that round,square, or other shapes, either taper or straight, may be held with likefacility.

Figure 1 is an end elevation of my improved chuck. Fig. 2 is allongitudinal Section taken O11 line .n of Fig. 1.

Similar letters of reference indicate corresponding parts. i r

A is the stock having a square socket in it, in which the jaw B, havingthe large A-Shaped notch C, is tted to slide transversely, and has anadjusting screw, D, provided for shifting it. E represents other jawsfixed on the rod F, to move toward and from each other at right angleswith the directions'in which jaw v B moves, and being iitt-ed in thenotch parallel with its inclined sides respectively, the

parts fitted therein being notched or toothed: so as to mesh togetherand close into each other for increasing and diminishing the spacebetween themand the bottom of the notch C, and between said jawsaresprings H, which pen them when jaw B is moved back, and allow them toclose when it is moved forward on them.' The pin F is located at theinner end of the chuck, and the jaw B is free to oscillate a little, sothat the jaws will accommodate themselves to a taper shape, and theywill take a round, square, or other form.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination of the sliding and oscillating jawB, having notch C, and the laterally-adjusting notched and meshing jawsE, substantially as Specified.

2. The combination of springslrl with the jaws E and B, substantially asspecified.

' WILLIAM FROST.

Witnesses: l

OETON S. SIMPSON, WILLIAM ROSOOE.

